<!--
 * @Author: 清香白莲 1243327527@qq.com
 * @Date: 2023-08-11 15:04:06
 * @LastEditors: 清香白莲 1243327527@qq.com
 * @LastEditTime: 2023-09-19 17:24:18
 * @FilePath: /shang_study/src/pages/Detail/Zoom/Zoom.vue
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<template>
  <div class="spec-preview">
    <img :src="imgObj.imgUrl" />
    <div class="event" @mousemove="handler"></div>
    <div class="big">
      <img :src="imgObj.imgUrl" ref="big"/>
    </div>
    <div class="mask" ref="mask"></div>
  </div>
</template>

<script>
  export default {
    name: "Zoom",
    data() {
      return {
        select: 0,
      }
    },
    props: ['skuImageList'],
    computed: {
      imgObj() {
        return this.skuImageList[this.select] || {};
      },
    },
    mounted() {
      this.$bus.$on('clickGoodsImage', (select)=> {
        this.select = select;
    })
    },
    methods: {
      handler(event) {
        let mask = this.$refs.mask;
        let left = event.offsetX - mask.offsetWidth/2;
        let top = event.offsetY - mask.offsetHeight/2;
        left = left < 0 ? 0 : left;
        left = left > mask.offsetWidth ? mask.offsetWidth : left;
        top = top < 0 ? 0 : top;
        top = top > mask.offsetHeight ? mask.offsetHeight : top;
        mask.style.left = left + 'px';
        mask.style.top = top + 'px';

        let big = this.$refs.big;
        big.style.left = -2 * left + 'px';
        big.style.top = -2 * top + 'px';
      }
    },
  }
</script>

<style lang="less">
  .spec-preview {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #ccc;

    img {
      width: 100%;
      height: 100%;
    }

    .event {
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      z-index: 998;
    }

    .mask {
      width: 50%;
      height: 50%;
      background-color: rgba(0, 255, 0, 0.3);
      position: absolute;
      left: 0;
      top: 0;
      display: none;
    }

    .big {
      width: 100%;
      height: 100%;
      position: absolute;
      top: -1px;
      left: 100%;
      border: 1px solid #aaa;
      overflow: hidden;
      z-index: 998;
      display: none;
      background: white;

      img {
        width: 200%;
        max-width: 200%;
        height: 200%;
        position: absolute;
        left: 0;
        top: 0;
      }
    }

    .event:hover~.mask,
    .event:hover~.big {
      display: block;
    }
  }
</style>